github.com/muhammedhassanm/blockchain@v0.0.0-20200120143007-697261defd4d/sawtooth-supply-chain-master/bin/splice_json (about)

     1  #!/usr/bin/env node
     2  
     3  /**
     4   * Copyright 2017 Intel Corporation
     5   *
     6   * Licensed under the Apache License, Version 2.0 (the "License");
     7   * you may not use this file except in compliance with the License.
     8   * You may obtain a copy of the License at
     9   *
    10   *     http://www.apache.org/licenses/LICENSE-2.0
    11   *
    12   * Unless required by applicable law or agreed to in writing, software
    13   * distributed under the License is distributed on an "AS IS" BASIS,
    14   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    15   * See the License for the specific language governing permissions and
    16   * limitations under the License.
    17   * ----------------------------------------------------------------------------
    18   */
    19  
    20  const { resolve } = require('path')
    21  
    22  const baseDir = process.cwd()
    23  const jsonPaths = process.argv.slice(2)
    24  
    25  // Deeply combines objects, overwriting primitive data, but recursively
    26  // checking nested objects for unique keys. For example:
    27  //   {a: 1, b: {c: 2}} + {a: 3, b: {x: 5}} -> {a: 3, b: {c: 2, x: 5}}
    28  const spliceObjects = (a, b) => {
    29    return Object.keys(b).reduce((spliced, key) => {
    30      if (typeof a[key] === 'object' && typeof b[key] === 'object') {
    31        spliced[key] = spliceObjects(a[key], b[key])
    32      } else {
    33        spliced[key] = b[key]
    34      }
    35      return spliced
    36    }, Object.assign({}, a))
    37  }
    38  
    39  // Splice the JSON files specified then sent to stdout as JSON string
    40  process.stdout.write(JSON.stringify(jsonPaths
    41    .map(relPath => resolve(baseDir, relPath))
    42    .map(absPath => require(absPath))
    43    .reduce((spliced, jsonObj) => spliceObjects(spliced, jsonObj), {})))